org.dominokit.jacksonapt.AbstractObjectMapper Maven / Gradle / Ivy
/*
* Copyright 2013 Nicolas Morel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dominokit.jacksonapt;
import org.dominokit.jacksonapt.deser.array.ArrayJsonDeserializer;
import org.dominokit.jacksonapt.exception.JsonDeserializationException;
import org.dominokit.jacksonapt.exception.JsonSerializationException;
import org.dominokit.jacksonapt.stream.JsonReader;
import org.dominokit.jacksonapt.stream.JsonToken;
import org.dominokit.jacksonapt.stream.JsonWriter;
/**
* Base implementation of {@link org.dominokit.jacksonapt.ObjectMapper}. It delegates the
* serialization/deserialization to a serializer/deserializer.
*/
public abstract class AbstractObjectMapper implements ObjectMapper {
private final String rootName;
private JsonDeserializer deserializer;
private JsonSerializer serializer;
/**
* Constructor for AbstractObjectMapper.
*
* @param rootName a {@link java.lang.String} object.
*/
protected AbstractObjectMapper(String rootName) {
this.rootName = rootName;
}
/** {@inheritDoc} */
@Override
public T read(String in) throws JsonDeserializationException {
return read(in, DefaultJsonDeserializationContext.builder().build());
}
/** {@inheritDoc} */
public T read(String in, JsonDeserializationContext ctx) throws JsonDeserializationException {
JsonReader reader = ctx.newJsonReader(in);
try {
if (ctx.isUnwrapRootValue()) {
if (JsonToken.BEGIN_OBJECT != reader.peek()) {
throw ctx.traceError(
"Unwrap root value is enabled but the input is not a JSON Object", reader);
}
reader.beginObject();
if (JsonToken.END_OBJECT == reader.peek()) {
throw ctx.traceError("Unwrap root value is enabled but the JSON Object is empty", reader);
}
String name = reader.nextName();
if (!name.equals(rootName)) {
throw ctx.traceError(
"Unwrap root value is enabled but the name '"
+ name
+ "' don't match the expected rootName "
+ "'"
+ rootName
+ "'",
reader);
}
T result = getDeserializer().deserialize(reader, ctx);
reader.endObject();
return result;
} else {
return getDeserializer().deserialize(reader, ctx);
}
} catch (JsonDeserializationException e) {
// already logged, we just throw it
throw e;
} catch (RuntimeException e) {
throw ctx.traceError(e, reader);
}
}
/** {@inheritDoc} */
@Override
public T[] readArray(String input, ArrayJsonDeserializer.ArrayCreator arrayCreator)
throws JsonDeserializationException {
return readArray(input, DefaultJsonDeserializationContext.builder().build(), arrayCreator);
}
/** {@inheritDoc} */
@Override
public T[] readArray(
String input,
JsonDeserializationContext ctx,
ArrayJsonDeserializer.ArrayCreator arrayCreator)
throws JsonDeserializationException {
ArrayJsonDeserializer jsonDeserializer =
ArrayJsonDeserializer.newInstance(getDeserializer(), arrayCreator);
return jsonDeserializer.deserialize(ctx.newJsonReader(input), ctx);
}
/**
* {@inheritDoc}
*
* Getter for the field deserializer.
*/
@Override
public JsonDeserializer getDeserializer() {
if (null == deserializer) {
deserializer = newDeserializer();
}
return deserializer;
}
/**
* Instantiates a new deserializer
*
* @return a new deserializer
*/
protected abstract JsonDeserializer newDeserializer();
/** {@inheritDoc} */
@Override
public String write(T value) throws JsonSerializationException {
return write(value, DefaultJsonSerializationContext.builder().build());
}
/** {@inheritDoc} */
public String write(T value, JsonSerializationContext ctx) throws JsonSerializationException {
JsonWriter writer = ctx.newJsonWriter();
try {
if (ctx.isWrapRootValue()) {
writer.beginObject();
writer.name(rootName);
getSerializer().serialize(writer, value, ctx);
writer.endObject();
} else {
getSerializer().serialize(writer, value, ctx);
}
return writer.getOutput();
} catch (JsonSerializationException e) {
// already logged, we just throw it
throw e;
} catch (RuntimeException e) {
throw ctx.traceError(value, e, writer);
}
}
/**
* {@inheritDoc}
*
* Getter for the field serializer.
*/
@Override
public JsonSerializer getSerializer() {
if (null == serializer) {
serializer = (JsonSerializer) newSerializer();
}
return serializer;
}
/**
* Instantiates a new serializer
*
* @return a new serializer
*/
protected abstract JsonSerializer newSerializer();
}